"I have people in awe of me," Harry said tightly, squinting against the drums battering the inside of his skull. "I am also, like this, more or less actually in control of myself. I'd prefer to keep it that way, thank you."
He took a deep breath, and clamped down on the tantalising little voice in the back of his head that was whispering that what John was suggesting would be fun, wouldn't it? and said firmly, turning on his heel and starting to walk away, "I'm leaving now. Good day to you."